One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,9,12)(7,10,13,16)(8,11,15,18)(14,17,19,20)(21,22,26,31)(23,27,33,29)(24,30,25,35)(28,34,36,32)(1,2,3,4)(5,7)(6,10)(8,14)(9,13)(11,17)(12,16)(15,19)(18,20)(21,23,26,33)(22,27,31,29)(24,34,25,32)(28,30,36,35)(7,13)(10,16)(14,19)(17,20)(21,23)(22,28)(24,32)(25,34)(26,33)(27,35)(29,30)(31,36) involution — undirected(5,8)(6,11)(7,14)(9,15)(10,17)(12,18)(13,19)(16,20)(21,23)(22,29)(24,34)(25,32)(26,33)(27,31)(28,30)(35,36) involution — undirected(8,15)(11,18)(14,19)(17,20)(21,24,26,25)(22,30,31,35)(23,32,33,34)(27,28,29,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.